Amy Poehler arrives at the 64th Primetime Emmy Awards. Credit: Jeff Kravitz/FilmMagic

Bodacious after breakup!

On the red carpet for Sunday's 2012 Emmy Awards at the Nokia Theater in Los Angeles -- her first carpet walk since she and Will Arnett broke news of their separation to Us Weekly -- Amy Poehler showed her sexiest side yet.

With her blonde locks in sultry, bombshell waves, the newly single 41-year-old mother of two wore a stunning Stella McCartney gown, featuring a plunging neckline that showed off her cleavage.

Nominated for two Emmy Awards this year -- for Outstanding Lead Actress in a Comedy and Outstanding Writing for a Comedy, both for Parks and Recreation -- Poehler didn't mention her shocking split from Arnett, 42, when chatting with Ryan Seacrest. But one of her boys with Arnett -- Archie, 3, and Abel, 2 -- helped dress her for the big night. "This is a two dollar adjustable ring from my child's toy box," she told Seacrest.

Although bubbly during her chat, an insider told Us Weekly that behind the scenes, "The past few months have been rough for them . . .I don't think anyone in their circle saw this coming."

Still, Poehler and Arnett "have a lot of respect for each other," the source says.